PROCEED HPA 3 Bedienerhandbuch PDF herunterladen (Seite 27)

Instruction Manual

D101634X012

HP and HPA Valves

October 2014

8. Inspect the lower seating surface where the valve plug contacts the seat ring for wear or damage which would

prevent proper operation of the valve. Also, inspect the upperseatingsurfaceinsidethecagewheretheC-sealplug

seal contacts the cage, and inspect the sealing surface where the C-seal plug seal makes contact with the plug

(figure 14).

Figure 14. Lower (Valve Plug to Seat Ring) and Upper (C-seal Plug Seal to Cage) Seating Surfaces

C-seal METAL

PLUG SEAL

RETAINER

CAGE

VALVE PLUG

NOTE:

UPPER SEATING SURFACE IS THE AREA OF CONTACT BETWEEN THE C-seal METAL PLUG SEAL AND THE CAGE.

PLUG

CAGE

SEAT

RING

UPPER SEATING SURFACE

LOWER SEATING SURFACE

A6780

9. Replace or repair trim parts according to the following procedure for Lapping Metal Seats, Remachining Metal

Seats, or other valve plug maintenanceproceduresasappropriate.

Lapping Metal Seats (C-seal Constructions)

Before installing a new C-seal plug seal, lap the lower seating surface (valve plug to seat ring, figure 14) following

appropriate procedures in the Lapping Seats section in this manual.

Remachining Metal Seats (C-seal Constructions)

See figure 15. A valve plug with a C-seal metal plug seal features two seating surfaces. One seating surface is found

wherethevalveplugcontactstheseatring. The second seating surface is found where the C-seal plug seal contacts

the upper seating surface in the cage. If you machine the seats on the seat ring and/or plug, you must machine an

equal dimension from the seating area in the cage.

CAUTION

If metal is removed from the seat ring and plug and a corresponding amount is not removed from the cage seating area, the

C-seal plug seal will be crushed as the valve closes and the C-seal retainer will strike the seating area of the cage, preventing

the valve from closing.

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PROCEED HPA 3 Bedienerhandbuch Seite 27